Method of drying molds.



J. G. DAVIS.

METHOD OF DRYING MOLDS.

APPLICATION FILED DEO.3,1909.

Patented Aug. 16, 1910.

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Jlhhllfilfi "U. DAVIS, UIF HINSDALE, ILLINOIS, ASSIGNOR T AMERICAN STEELFOUNDRLEQ, @F NEW. YORK, N. 1., A. CORPORATION OF NEW JERSEY.

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Specification of letters Patent.

Patented Aug. is, 19m.

llllllfilfihl application tiled September 9,19%, Serial No. 391,961..Divided and this application filed December ll. 1909, Serial No.531,195.

To all whom it may concern:

Be it lmown that l, James C. DAVIS, a citizen ot the United States,residing at H1nsdale, in the county of Dupage and State of l /lyinvention relates to improvements in the methods used for heating anddrying molds employed tor the casting and founding of metal bodies orparts. The usual and ordinary method or process of drying molds is tohit the mold on to a car and run the car and mold into a drying oven towhich heat is applied by colic, coal, gas, or other suitable tool. Ithas been found, however, that molds transported and treated in thismanner are likely to be shaken up and injured by their handling, andalthough the mold is dried hard on its surface its interior is lilrelyto be left moist. y

it is the object of my invention to provide a process for heating anddrying molds without transporting them and making the drying of the moldcomplete throughout the entire body of sand. By my lmproved method theheat is supplied to the interior ot the sand of the mold by means ofsteam or other suitable treating element circulating through or ted topipes embedded in the sand. Preferably the cope and drag each has a pipecoil or lengths of pipe in its sand, the ends of the pipe being joinedwhen the cope is superposed on the drag, whereby the steam admitted tothepipe of one passes or circulates to the other. course, the supply andcirculation of steam and the pipes of the two parts of the mold may bequite distinct and separate.

in carryingout my improved method the drying element, preferably steam,is brought to the mold insteadot the latter being conveyed or carried tothe drying chamber, as is usually done, and in carrying out my methodthe heat is applied to the inside of the body of sand, and consequentlythe mold is sure to be thoroughly dried throughout and not shin dried.

in the accompanying drawing, forming a part of this specification, Ihave illustrated a simple and convenient apparatus for carrying on thisprocess, and inthis drawingl igure 1 is a plan view of the cope of theIt desired, of

is a plan view of the drag;

Fig. 3 is a side elevation of the parts of the mold assembled; and Fig.4 is an elevation of the right-hand end of the assembled mol shown inFig. 3.

Referring now to this mold suitable for carrying on my improved process,it will be noticed that the cope is of the usual and mold; Fi 2 ordinaryconstruction, and has embedded in its sand the lengths of pipe 11, 12,13, 14-, and 15, united byelbows of the ordinary form. The pipe '10extends outwardly through one end of the cope, and the protrudingportion is equipped with a steam inlet valve 16. The pipe 15 extendsthrough the other end of the co e and is connected by an elbow with ashort length of pipe 17 having at its end one element 18 of a unionwhich provides means for disengageably connecting the pipe 17 with asimllar ipe of the drag. It will be noticed from Fig. 1 that the pipeswithin the sand of the cope prov de three lengths substantially the fullongitudinal dimension of the cope, whereby a complete and thoroughheating of its sand may be secured. v

The drag 19 has embedded in its sand a pipe 20 which protrudes throughthe end of the drag and is connected by an elbow with a short pipe 21 onthe free end of which is the other member 22 of the union 18-22. Theother end of pipe 20, by-means of a cross-pipe 23, connects with anotherlon i- Y pipes 20, 24, 26, and 28 a thorough and complete drying of thesand of the drag may be readily efiected.

After the mold cavity 30 has been formed in the sand, the co e withitspipes is placed upon the drag and fastened thereto 1n any approvedmanner, as is indicated in Fig. 3.

Pipes 17 and 21 are disengageably connected by the union 1822, wherebythe pipes of the cope and drag are joined to form a continuous'conduitor tube for the passage of steam through or admission of steam to theparts of the assembled mold. Steam or other suitable heating element issupplied to the pipes by the opening of the valve 16, and may be allowedto exhaust through the valve 29 or the water of condensation permittedto dri'p through such latter valve. Owing to the fact that the steampipes are buried within the body of sand formin the mold, it isthoroughly heated and dried throughout, no skin drying alone beingeifected. Inasmuch as the heating element such as steam may be readilyconducted to the mold in any position or location, it is unnecessary totransport the mold to a drying chamber, thereby risking injury to thecarefully fashioned mold. As will be obvious, a disconnection betweenthe pipes 17 and 21 may be readily efiected, whereupon the cope can beeasily lifted from the drag.

To those skilled in the art it will be apparent that the precise numberof pipes or their location or disposition within the sand is quiteimmaterial, and that the structure shown in the drawing and describedabove is merely set forth as one way in which this method can beadvantageously carried out. The disposition of the steam pipes withinthe sand of the mold, as will be readily understood, may be varied tocorrespond with different shapes of mold cavities, but in any case thepipes would be buried within the sand and e ect the drying operation asdescribed above, that is, from the interior of the sand outwardly.

I have deemed it unnecessary to illustrate the steam generator or othersource of supply of the heating element, but it is to be understood thatthe pipe 11 is intended to be connected by any suitable means with aboiler generating steam or other source of supply of a suitable heatingelement.

This a plication is a division of m former app cation Serial No.391,961, filed September 9, 1907.

I claim:

1. The method of drying a mold which consists in passing a heatinginedium through the material of the mold between the mold cavity and theexterior of the mold and maintaining the heating medium out of directcontact with the material of the mold, substantially as described.

2. The method of drying a mold which consists in passing steam throughthe material of the mold between the mold cavity and the exterior of themold and maintaining the steam out of direct contact with the materialof the mold, substantially as described.

3. The method which consists in drying a mold by radiation from aheating medium located in the body of the mold exterior of the moldcavity and out of direct contact with the material of the mold,substantially as described.

4. The herein described method of drying molds which consists incirculating a heating medium through the material of the mold betweenthe mold cavity and the exterior of the mold and out of direct contactwith the material of the mold, substantially as described.

JAMES C. DAVIS. Witnesses:

W. H. CAMERON, A. G. Frscrmu.

